Suppose I have this method:
1. public int sum(int a, int b){ 2. int x = 0; 3. 4. return x; 5. } Is it possible to get a string x = a + b; and place in line 3 (during runtime), so that after this string is inserted, the code now does the sum of a and b?
I wanna write some code in a text input field, so when I press a button, all that code (that is a string) should be able to go inside some part of some existing code. The sum above is just an example but it can be anything.
Instead of inserting string, you could pass a Func<> to the method as parameter. For example,
public int sum(int a, int b,Func<int,int,int> expression = null) { int x = expression == null ? 0 : expression(a,b); return x; } Now, you could use the method as
var result1 = sum(1,2); // When you do not want to add the numbers var result2 = sum(1,2,(a,b)=>a+b); // when you want to add the numbers 
x = a + b; was just an example, but I wanna have a string that holds a lot of code that that performs lots of actions and put it into a void method at runtime. A lambda expression wouldn't fit because I'm expecting the user to write some code and I'll just insert it inside some existing code.